With the help of Bob Franke's CCD-BandAid tool, I could correct my images from the Tadpole Nebula. I then used the tutorial from Ken Crawford on how to combine narrowband images in Photoshop:
The Tadpole Nebula (IC 410) is an emission nebula around an open star cluster (NGC 1893). The "tadpoles" are clumps of gas and dust from the formation of the cluster. Inside them, new stars are born. The tails from the "tadpoles" are caused by the solar wind of the stars of NGC 1893 (that's why the point away from the star cluster).